To change your Roaming Password, click the 'Advanced' button in the client, then in the "Advanced Functions" screen, click 'Change your password'.

You will need to provide your current password and a new password.

If you need to change the password because you have forgotten the current one, you can change your Roaming Password through the Certificate Management Center (CMC).

When you click the link for CMC, it will initially ask you to choose your certificate to log in with. Click 'Cancel' on that screen, and it will allow you to log in using your account number and DST Passphrase.

Within CMC, in the "Manage your certificates" section, there is an option to change your Roaming Password.